If you choose to take Fildena 100mg , you should not take more than one tablet in a single day as the medication's effects can last up to 3 to 6 days. This is an oral tablet that you can take as directed by your doctor, either with or without food and one glass of water. Because Fildena pills is a pde-5 inhibitor tablet, it aids in blood flow, allowing men to have an extended erection during sex.